<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>class形式绑定</title>
    <style>
        .active { text-decoration: underline; }
        .text-danger {font-weight: bold; }
    </style>
    
</head>
<body>
    <script src="../js/vue.js"></script>
    <div id="app">
        <!--对象语法 传 布尔值-->
        <div v-bind:class="{active: isActive, 'text-danger': hasError}">Hello</div>
        <div v-bind:class="classObj">Vue.js</div>
        <!--数组语法 传 字符串-->
        <div v-bind:class="[activeClass, errorClass]">Hello Vue!</div>
        <!--xx ? xx : xx数组语法 三元表达式-->
        <div v-bind:class="[isActive ? 'active' : '',hasError?'text-danger':'']">Hello School!</div>
        <button @click="btnClick">button</button>
        <br>
        <!--对象语法 对象里面传字符串-->
        <div v-bind:style="{color:activeColor,fontSize:fontSize+'px'}">Hello World!</div>
        <div v-bind:style="styleObj">Vue.js</div>

        <!--数组语法 数组里面传对象-->
        <div v-bind:style="[baseStyle, moreStyle]">Hello Vue.js</div>
    </div>
     
    <script>
        let app = new Vue({
          el:"#app",  
          data: {
            msg: 'helo world',
            isActive: true,
            hasError: true,
            classObj: {
                active: true,
                'text-danger': true
            },
            activeClass: 'active',
            errorClass: 'text-danger',
            activeColor:'red',
            fontSize: 30,
            styleObj: {
                fontSize: '30px',
                'text-decoration': 'underline'
            },
            baseStyle: {
                border: '2px solid black'
            },
            moreStyle: {
                width: '100px',
                height: '100px'
            },	
            methods:{
                btnClick(){
                this.isActive=!this.isActive,
                this.hasError=!this.hasError
                }
            }
        } 
    }) 
    </script>
</body>
</html>